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-.TH REQUEST 9.2
-.CT 2 comm_term time_man proc_man
-.SH NAME
-request, own, wait, alarm, sleep, nap, kbdchar, rcvchar, realtime, sendchar, sendnchars, kill, exit \- 5620 input/output requests
-.SH SYNOPSIS
-.B #include <jerq.h>
-.PP
-.B void request(r) int r;
-.PP
-.B int own(r) int r;
-.PP
-.B int wait(r) int r;
-.PP
-.B void alarm(t) unsigned t;
-.PP
-.B void sleep(t) unsigned t;
-.PP
-.B void nap(t) unsigned t;
-.PP
-.B long realtime();
-.PP
-.B int kbdchar();
-.PP
-.B int rcvchar();
-.PP
-.B void sendchar(c) int c;
-.PP
-.B "void sendnchars(n, cp) int n; char *cp;"
-.PP
-.B void kill(s)
-.B int s;
-.PP
-.B void exit();
-.SH DESCRIPTION
-.I Request
-announces a program's intent to use I/O devices and resources,
-and is usually called once early in a program.
-The bit vector
-.I r
-indicates which resources are to be used by
-OR'ing together one or more of the elements
-.B KBD
-(keyboard),
-.BR MOUSE ,
-.B RCV
-(characters received by terminal from Unix),
-.B SEND
-(characters sent from terminal to Unix)
-and
-.BR ALARM .
-For example,
-.B request(MOUSE|KBD)
-indicates that the process
-wants to use the mouse and keyboard.
-If the keyboard is not requested,
-characters typed will be sent to the standard input of the Unix process.
-If the mouse is not requested,
-mouse events in the process's layer will be interpreted by the
-system rather than passed to the process.
-.B SEND
-and
-.B CPU
-(see 
-.B wait
-below) are always implicitly
-requested.
-.I Request
-sleeps for one clock tick to synchronize mouse control with the kernel.
-.PP
-.I Own
-returns a bit vector
-of which I/O resources have data available.
-For example,
-.BR own()&KBD
-indicates
-whether a character is available to be read by
-.I kbdchar
-(see below),
-.B own()&MOUSE
-tells if the process's
-.B mouse
-structure (see
-.IR button (9.2))
-is current, and
-.B own()&ALARM
-indicates whether the alarm timer has fired.
-.PP
-.IR Wait 's
-argument
-.I r
-is a bit vector composed as for
-.IR request .
-.I Wait
-suspends the process,
-enabling others,
-until at least one of the requested resources is available.
-The return value is a bit vector indicating which of the requested resources
-are available \(em the same as
-.BR own()&r .
-.PP
-Processes wishing to give up the processor to enable other processes to run
-may call
-.BR wait(CPU) ;
-it will return as soon as all other active processes have had a chance to run.
-.B CPU
-is a fake resource which is always
-requested.
-The
-.B SEND
-pseudo-resource is unused;
-.B wait(SEND)
-always succeeds.
-.PP
-.I Alarm
-starts a timer which will fire
-.I t
-ticks (60ths of a second) into the future.
-A pseudo-resource
-.B ALARM
-can be used to check the status of the timer with
-.I own
-or
-.IR wait .
-Calling
-.I alarm
-implicitly requests the
-.B ALARM
-pseudo-resource.
-.PP
-.I Nap
-busy loops for
-.I t
-ticks of the 60Hz internal clock.
-To avoid beating with the display, programs drawing rapidly changing scenes
-should
-.I nap
-for two ticks
-between updates, to synchronize the display and memory.
-.I Nap
-busy loops until the time is up;
-.I sleep
-is identical except that it
-gives up the processor for the interval.
-Except when unwilling to give up
-the mouse, a program should call
-.I sleep
-in preference to
-.IR nap .
-.I Sleep
-does not interfere with
-.IR alarm ,
-and vice versa.
-.PP
-.I Realtime
-returns the number of 60Hz clock ticks since
-.I mux
-started.
-.PP
-.I Kbdchar
-returns the next keyboard character typed to the process.
-If no characters have been typed, or
-.B KBD
-has not been
-.IR request ed,
-.I kbdchar
-returns
-\-1.
-.PP
-.I Rcvchar
-returns the next character received from the host,
-typically written on the standard output of a Unix process.
-If there are no characters available, or
-.B RCV
-has not been
-.IR request ed,
-.I rcvchar
-returns
-\-1.
-.PP
-.I Sendchar
-sends a single byte to the host,
-which will normally be read on the standard input of the Unix process.
-.I Sendnchars
-sends to the host
-.I n
-characters pointed to by
-.IR p .
-.PP
-.I Kill
-sends the associated Unix process the signal
-.IR s ;
-see 
-.IR signal (2).
-.PP
-.I Exit
-terminates the process.
-Unlike on Unix,
-.I exit
-does not return an exit status to a parent.
-Calling
-.I exit
-replaces the running process by the default terminal program.
-Any associated Unix process must arrange for its own demise;
-.I exit
-is a purely local function.
-When a process calls
-.IR exit ,
-all local resources: keyboard, mouse, storage, etc.,
-are deallocated automatically.
-.PP
-.I Realtime
-returns the number of sixtieths of a second elapsed since
-.IR mux (9.1)
-was started.
-.SH EXAMPLES
-.EX
-request(KBD|RCV);
-for(;;){
-	r=wait(KBD|RCV);
-	if(r&KBD)
-		keyboard(kbdchar());
-	if(r&RCV)
-		receive(rcvchar());
-}
-.EE
-.PD0
-.IP
-Take input from either the keyboard or the host.
-.PD
-.SH SEE ALSO
-.IR button (9.2)
-.SH BUGS
-.B own()&MOUSE
-does not guarantee that you own the mouse.
-The correct test is
-.EX
-	(own()&MOUSE) && ptinrect(mouse.xy, Drect)
-.EE